Wind turbine generator optimization control method based on multi-objective model prediction

Abstract

The invention relates to the field of wind power generation and discloses a wind turbine generator optimization control method based on multi-objective model prediction. According to the method, basedon conventional virtual inertia control, a current loop with finite set model predictive control is adopted, and current, frequency and electromagnetic torque are used as optimization objectives, sothat the control has the characteristic that multiple objectives are optimized at the same time, the stability of the frequency is effectively enhanced in a frequency disturbance process, and meanwhile shafting oscillation caused by disturbance is restrained; on the basis of a conventional constant weight coefficient, dynamic weight coefficient control is realized through a power function structure; the weight coefficient of each optimization objective can be adjusted under different working conditions, the stability of a wind power generation system is further enhanced; the designed control structure enables a permanent magnet synchronous generator set to have higher inertia and frequency supporting capacity, and the stability of the system is improved while virtual inertia is obtained.

Description

technical field [0001] The invention relates to the field of wind power generation, and specifically proposes an optimal control method for wind turbines based on multi-objective model prediction. Background technique [0002] As a clean energy, wind energy is an indispensable part of the field of new energy power generation. With the increasing demand for wind power generation in my country, large-capacity and high-proportion wind power systems are continuously integrated into the grid, which has an impact on the stability of the grid frequency. The traditional thermal power unit itself has a large moment of inertia, and when the frequency of the power grid fluctuates, the thermal power unit can spontaneously release compensation energy according to the power fluctuation, thereby maintaining the stability of the frequency, although the generator itself of the wind power unit also has inertia, However, the grid-connected control structure on the grid side decouples the outpu...

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Problems solved by technology

[0007] 1. When the system disturbance is large, the inertia is insufficient, and the kinetic energy of the rotor cannot provide sufficient active support;

[0008] 2. There are problems in the existing methods that may cause system frequency instability, shaft oscillation and other problems that endanger system stability;

[0009] 3. The existing method cannot adjust the weight coefficient in real time according to the external wind speed, and the control accuracy is not high

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